Many “excrement shoveling officers” have encountered such scenes: pinch the back of the cat’s neck, it will instantly quiet down, motionless, as if applied “immobilization”. This phenomenon can be said to be a kind of “conditioned reflex”, and its formation is related to the childhood experience of cats. It usually takes a few weeks for cats to walk independently and smoothly after birth. Before that, their actions need the help of their mothers. The way a female cat moves her cubs is by holding her neck behind her. < / P > < p > in order to enable the mother to move himself safely and smoothly, the baby will stop when she is caught by her neck. Studies have shown that when a mother holds a baby by the neck, the baby’s heart rate drops, stops singing, and the body becomes tense and resistant. This physiological change is realized by parasympathetic nerve and cerebellum. < / P > < p > whenever they feel that they are moved by their mothers, the cubs will make a series of physiological reactions, and the memory of being bitten by their mothers at the back of their necks will continue to move into adulthood, which leads to the phenomenon that cats do not move after being pinched at the back neck.